In a message dated 6/28/2005 10:46:07 A.M. Mountain Standard Time,
gunnellj@krause.com writes:
The air piston has to
have a certain weight. That weight can be achieved simply through mass (the
brass piston) or through mass plus the force of a spring (aluminium piston
and spring).
It is actually the downward force of the piston that is accomplished by
either the weight of the piston alone or its weight plus a spring. The end
result, however, is not exactly the same. If you are using piston weight
alone,
the downward force is always the same no matter if the piston is all the way
down, all the way up, or somewhere in between. If you use a spring, you have
the constant downward force of the lighter piston, plus an additional
downward force created by compression of the spring. The force added by the
spring
depends on the amount the spring is compressed. So, the total downward force
of a piston plus spring setup is higher with the piston near the top of its
travel and lower near the bottom. This can have a small effect on the
carb's performance profile.
RayG
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